package com.cloud.jvm;

/**
 * vm 参数：
 * -verbose:gc
 * -Xms20M -Xmx20M -Xmn10M -XX:+PrintGCDetails
 * -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=1
 */
public class GCTest {

    private static final int _1MB = 1024*1024;

    public static void testTenuringThreshold() {
        byte [] allocation1, allocation2, allocation3;

        allocation1 = new byte[_1MB / 4];
        allocation2 = new byte[4 * _1MB];
        allocation3 = new byte[4 * _1MB];

        allocation3 = null;
        allocation3 = new byte[4 * _1MB];
    }

    public static void main(String[] args) {
        testTenuringThreshold();
    }
}
